The kitchen is referred to as the kitchen, oddly enough. The actual canteen/cafetaria is only ever referred to as the 'dining area', at least within earshot of the Sergeant Maitre D'. The lowest rank is Bottlewasher, followed by Lance Garçon and full Garçon. It's worth bearing in mind that it is customary to tip your waiter for the exemplary service that they're all happy to provide.

Not really. The cookhouse is where you eat your 3 meals a day, lovingly prepared by the slop-jockeys. The canteen is where you go during a break in work to get a cup of tea from Fag Ash Lil and have a smoke.

& the COOKHOUSE is inhabited & run by SLOP JOCKEY's, especially those of the PASTRY FACED variety.

However, you need to be aware of the Head Pastry Faced Slop Jockey, who is normally about 20 stone & carries a SOUP LADLE. This is used to show those who don't clearly understand the "onefuckinsausage" Rule, the error of their ways.

A cafeteria is a place where old people go to drink tea and eat custard tarts. A kitchen is where food is cooked. A canteen is a container for holding drinkable liquids or a work place dining facility such as a factory.
Some old people like Bakewell tarts I must add and some even like coffee.